Transmission



July 29, 1930.

B. A. MITCHELL TRANsMIssl'oN Filed April 19, 1928 lili@ 2 Sheets-Sheet 1 July 29, 1930. B. A. MITCHELL 1,771,806 TRANSMISSION l l Filed April 19. 1928 2 Sheets-Sheet 24 l ff "n \f v m i ml H A I "i l Patented July 29, 1930 UNITED STATES PATENT BENJAMIN A. iurfrcI-IELL,Av or NEW YORK, N. Y.

TRANSMISSION i .ApplicationV led April 19,

ber ofthe impeller being pressed by a springis inv a radial direction against the gyratory member. The inventionwill bemore fully explained hereinafter with reference to thev accompanying .drawings in which it is illustratedand-in which: 2o F igure 1 is a view 1n longitudinal sectionalv elevation of a form` of transmissionv in, which the invention' is embodied.

' Figure Qlis a view of the same inv transverse section on the'plane indicated by the broken line Q-Q-OfYFigure 1.

In the embodiment of the invention illustrated in the drawings the several working parts are supported by a housing which comprises a cylindrical portion a' and end plates 3o and 1. `The driving'r shaft@ isv supported in suitable bearings in a cylindrical extension b2 from the end plate b, and the driven shaft Z is similarly supported in an extension b3 of the end plate b1. A frusto conical gyratory member e is supported so as to have a free movement of gyration about its axis of gyration7 indicated at el, preferably being supported, through its hub e2 and a self-aligning anti-friction bearing e3, in an enlargement b4 at the inner end of the extension or hub b3 of the end of the plate b1. The gyratory member is operatively connected with the driven shaft Z through a universal coupling e4 which may be of any usual or suitable con- 15 struction. f

In the embodiment of the invention illustrated the impeller is arranged to rotate within the circumscribing shell of the gyratory member e, having a contact roller f, adapted 5J for contact with a track e5 formed onthe in-` 1928. Serial No. 271,139.

ner surface ofthe shell of'thegyratoryfmem'- ber e. This roller is supported by a selfaligning anti-friction bearing fl on a bloekfz which is carried by radial' rodsf3; 'lherlatteri pass Vfreely throughfthe drivingshaft-oland-y l i at their other ends carry-fa'fweight'fiwhich eounterbalances themass of theimpelleron the other s ide of the drivings-haft, including# aspring f5 which is interposedbetween the; shaft c and the block f2, thusholding the -rolll er resiliently in operative relationwith the gyratory member e. v v

' also, in the embodiment of the-inventionv illustrated the gyratory member'e is shown as `having Contact externally-wither circula-r, c'ircumscribingtrack gf. Fory the purposelof effecting variation in speed ,between the driv-y ingfmember and the' driven member of the transmission, the track g ism/ade adjustable in position longitudinally with respect toithe axis ofgyration of the `gyrat'ory member. Asy shown, itis carried by .three screws 915 which may beactuated together through the mediumof a hand wheel-g2- on one of thescrewshagfts; sprocket' vvheelsrfg3 onv the several shaft'sand- 75 a common sprocket chain g 1 Assuming now that the driving'shaftis ro-l tated in a clockwise direction and thatfthe impellerr is carried with itin a clockwise di*- r'ection,V it will-be understoodlthatfbyl reason so of the lead which the contact roller" fha-sl 1 with respect to the pointof contact of thel roller against the track@5 ofi the gyr'atory member an` over-turning moment willibeteil-l erted about the pointof Contact ofthe roller and the track, whichtends torcompressffthe spring )cF-and also' tends to increaseafs'tl1e` point of contact ofthe rollerwith the-track of the' gyratorymember movesbelyondthe radial line' of the pointof contact of the gyraf' tory member with the coacting circular ti'acky g, which is held in arelativ'ely fixed.positiomV thatis, against rotation in its ownlplane. In thisvmanner, the gyratory member will be caused to rollagpa-inst the track gv and` thereby 95 to `acquire i al rotation about its own axisjina counter-clockwised'irection, whichrotation will be'imparted', throughthe couplinget; to the driven shaftcl'.- The-'speed (5f-rotationof the driven member will :have the 'same-ii-tiolA 100 to the speed of rotation of the driving member as the ratio of the diameter of the relatively fixed circular track g and the diameter of the gyratory member in the line of Contact with the track. The speed ratio thusv becomes variable through the shifting of the relatively fixed track g in alongitudinal direction with respectv to the `axis ofthe gyratory member.

l claim as my invention:

1. A transmission comprising a driving member, a driven member, a gyratory member free to gyrate about its axis of gyration in the manner of a gyratory pendulum, a universal coupling between the gyratory member and the driven member, a radially movable rod carried by the driving member, a roller supported by said rod for Contact with thegyratory member, a spring arranged to press the `roller against the gyratory member, and a relatively fixed circular track for cooperation with the gyratory member. Y

I .2. A transmission comprising a driving member, a driven member, a hollow gyratory member free to gyrate about its axis of gyration in themanner of a gyratory pendulum, a universal coupling etweenthe gyra-l tory member and the driven member, a spring pressed impeller carried by the driving member for Contact withvthe internal track of the gyratory member, anda relatively iixed circular track circumscribing the gyratory member for contact therewith.

3. A transmission comprising a circular housing,.end plates therefor, a driving shaft v mounted in one of the end plates, a driven sha-ft mounted in the other end plate, a gyratory member supported within the housing bythe second named endplate, a universal coupling between'the gyratory member and the Vdriven shaft, a spring pressedimpeller carried by the driving shaft, means to hold the impeller resiliently in cooperative relation with the gyratory member, and a reatively fixed circular track supported by the f housing for cooperation with the gyratory member. f

4. A transmission comprising a driving member, a driven member, a member mounted to gyrate about a fixed pointin the manner of a gyratory conical pendulum, a universal coupling-between the gyratory member andthe driven member, an'impeller carried by the driving member, means to hold the impeller resiliently in cooperative relation with the gyratory member, anda relatively ixed circular' track for cooperation with the gyratory member.

v 5. A transmission' comprising a driving member, a driven member, a member mounted to gyrate about a fixed point in line with the axis of the driving and driven members in the mannerl ofa gyratory pendulum, a universalv coupling between the gyratory member and the driven member, an impeller carried by the .drivingmemben means to 1,771,eoe

hold the impeller resiliently in cooperative relation with the gyratory member, and a relatively fix-ed circular track for cooperation with the gyratory member.

6. A transmission comprising a driving member, a driven member, a member mounted to gyrate about a fixed point in the manner of a gyratoryconical pendulum, a universal coupling between the gyratory member and the driven'member, power imparting means carried by the driving member for cooperation with the gyratory member,

resilient means for holding the power imparting means in operative relation with the gyratory member, and a relatively fixed circular track for cooperation with the gyratory member.

7. A transmission comprising a driving member, a driven member, a hollow frusto conical member mounted to gyrate about a fixed point in the manner of a gyratory conicalpendulum, a universal coupling between the gyratory memberand the driven member, spring presse-d power imparting means carried by the driving member for cooperation with the gyratorymember and a circular track supported by the housing for cooperation with the surface of the inclined sides of the gyratory member.

8. A transmission comprising a driving member, a driven member,a hollow conical gyratory member mounted to gyratev about a fixed point in the manner of a gyratory conical pendulum in an orbit of constant diameter, a universal coupling between the gyratory member and the driven member, spring pressed bearing means for maintaining vthe driving member and the gyratory member in operative relation, and a relatively fixed circular track for cooperation with a surface of the inclined sides of said hollow conical gyratory member.

This specification signed this 26th day of March, A. D. 1928.

BENJAMIN A. MITCHELL.V 

